package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.PasswordConstant;
import com.sky.constant.StatusConstant;
import com.sky.context.BaseContext;
import com.sky.dto.EmployeeDTO;
import com.sky.dto.EmployeeLoginDTO;
import com.sky.dto.EmployeePageQueryDTO;
import com.sky.dto.PasswordEditDTO;
import com.sky.entity.Employee;
import com.sky.exception.AccountLockedException;
import com.sky.exception.AccountNotFoundException;
import com.sky.exception.PasswordEditFailedException;
import com.sky.exception.PasswordErrorException;
import com.sky.mapper.EmployeeMapper;
import com.sky.result.PageResult;
import com.sky.result.Result;
import com.sky.service.EmployeeService;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.util.DigestUtils;

import java.time.LocalDateTime;
import java.util.List;

@Service
public class EmployeeServiceImpl implements EmployeeService {

    @Autowired
    private EmployeeMapper employeeMapper;

    /**
     * 员工登录
     */
    @Override
    public Employee login(EmployeeLoginDTO employeeLoginDTO) {
        String username = employeeLoginDTO.getUsername();
        String password = employeeLoginDTO.getPassword();

        //1、根据用户名查询数据库中的数据
        Employee employee = employeeMapper.getByUsername(username);

        //2、处理各种异常情况（用户名不存在、密码不对、账号被锁定）
        if (employee == null) {
            //账号不存在
            throw new AccountNotFoundException(MessageConstant.ACCOUNT_NOT_FOUND);
        }

        //密码比对
        //将前端传来的密码进行md5加密后与数据库中存储的密码比对
        password = DigestUtils.md5DigestAsHex(password.getBytes());
        if (!password.equals(employee.getPassword())) {
            //密码错误
            throw new PasswordErrorException(MessageConstant.PASSWORD_ERROR);
        }

        if (employee.getStatus() == StatusConstant.DISABLE) {
            //账号被锁定
            throw new AccountLockedException(MessageConstant.ACCOUNT_LOCKED);
        }

        //3、返回实体对象
        return employee;
    }

    /**
     * 条件分页查询
     */
    @Override
    public PageResult page(EmployeePageQueryDTO employeePageQueryDTO) {
        PageHelper.startPage(employeePageQueryDTO.getPage(), employeePageQueryDTO.getPageSize());
        List<Employee> list = employeeMapper.selectAll(employeePageQueryDTO);
        Page<Employee> p = (Page<Employee>) list;
        return new PageResult(p.getTotal(), p.getResult());
    }

    /**
     * 新增员工
     */
    @Override
    public void save(EmployeeDTO employeeDTO) {
        Employee employee = new Employee();
        BeanUtils.copyProperties(employeeDTO, employee);
        employee.setCreateTime(LocalDateTime.now());
        employee.setUpdateTime(LocalDateTime.now());
        employee.setStatus(StatusConstant.ENABLE);
        String password = DigestUtils.md5DigestAsHex(PasswordConstant.DEFAULT_PASSWORD.getBytes());
        employee.setPassword(password);
        //通过线程获取当前登录用户
        employee.setCreateUser(BaseContext.getCurrentId());
        employee.setUpdateUser(BaseContext.getCurrentId());
        employeeMapper.insert(employee);
    }

    /**
     * 根据id查询员工
     */
    @Override
    public Employee getById(Long id) {
        return employeeMapper.selectById(id);
    }

    /**
     * 修改员工信息
     */
    @Override
    public void update(EmployeeDTO employeeDTO) {
        Employee employee = new Employee();
        BeanUtils.copyProperties(employeeDTO, employee);
        employee.setUpdateTime(LocalDateTime.now());
        //通过线程获取当前登录用户
        employee.setUpdateUser(BaseContext.getCurrentId());
        employeeMapper.update(employee);
    }

    /**
     * 启用禁用员工账号
     */
    @Override
    public void startOrStop(Integer status, Long id) {
        Long currentId = BaseContext.getCurrentId();
        Employee employee = employeeMapper.selectById(id);
        employee.setStatus(status);
        employee.setUpdateTime(LocalDateTime.now());
        employee.setUpdateUser(currentId);
        employeeMapper.updateStatus(employee);
    }

    /**
     * 修改密码
     */
    @Override
    public void editPassword(PasswordEditDTO passwordEditDTO) {
        //根据id查询员工信息
        Employee employee = employeeMapper.selectById(BaseContext.getCurrentId());
        //将前端传来的旧密码进行md5加密后与数据库中存储的密码比对
        String oldPassword = DigestUtils.md5DigestAsHex(passwordEditDTO.getOldPassword().getBytes());
        if (!oldPassword.equals(employee.getPassword())) {
            throw new PasswordErrorException(MessageConstant.PASSWORD_ERROR);
        }
        //若比对成功，则将前端传来的新密码进行md5加密后更新到数据库中
        try {
            String newPassword = DigestUtils.md5DigestAsHex(passwordEditDTO.getNewPassword().getBytes());
            employee.setPassword(newPassword);
            employee.setUpdateTime(LocalDateTime.now());
            employeeMapper.update(employee);
        } catch (Exception e) {
            throw new PasswordEditFailedException(MessageConstant.PASSWORD_EDIT_FAILED);
        }
    }
}
